Rudy Paige and Piet van Zyl are both in doubt for the Blue Bulls' semi-final against Western Province on Saturday.

The two scrumhalves picked up concussions while with the Boks, and will have to successfully pass return-to-play protocols in order to be cleared for this weekend's clash.

Ruan Steenkamp has already been ruled out with a groin injury, but in at least some good news, Arno Botha has recovered from a shoulder injury and is back in training.

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